What was found
PK 1 OVL CAUTION MESSAGE LOST CABIN PRESS AT FL240 DECLARE EMR PK 2 CLSD ADVISORY. -C/A-FOUND CMC MESSAGES PACK NR 1 OVERPRESSURE AND HAD CB NR 2 PACK TRIPPING IAW AMM 45-45-00. REMOVED AND REPLACED PACK NR 1 OVERPRESSURE SWITCH IAW AMM 21-51-06. REMOVED AND REPLACED NR 2 PACK VALVE IAW AMM 21-51-01. PERFORMED OPERATIONAL TEST IAW AMM 21-51-00 OPC GOOD. NO DEFECTS NOR MESSAGES FOUND AT THIS TIME. PERFORMED OPC OF PACK NR 1 IAW AMM TASK 21-51-00-700-802-A. OPC GOOD.